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A 3-phase transmission line increases transmission efficiency when _________.
1. Power factor decreases
2. Current density increases
3. Line voltage increases
4. Length of the conductor increases

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Correct Answer - Option 3 : Line voltage increases

Explanation:

As transmitting the voltages, the power is being constant and P = VI cos ϕ.

So at higher voltages, to keep the power constant, the current will be less and hence we can minimize the transmission losses.

By increasing the power factor, the losses will get minimized.

So, an increase in voltage level and power factor improves transmission efficiency.

Advantages of high transmission voltage:

1. Reduces the volume of conductor material

The volume of conductor material required is inversely proportional to the square of transmission voltage and power factor. The greater the transmission voltage, the lesser is the conductor material required.

2. Increases transmission efficiency

Transmission efficiency increases when the line voltage is increased.

3. Decreases percentage line drop

Percentage line drop decreases when the transmission voltage increases.

Important Points:

Limitations of high transmission voltage:

1. The increased cost of insulating the conductors

2. The increased cost of transformers, switchgear and other terminal apparatus

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